
To explain: How the comparison occurs between the current atmospheric CO2 concentration and the concentrations over the past 420,000years.
Concept introduction: The amount of CO2 concentration in the atmosphere is quite less compared to other gases. CO2 is the essential raw element for photosynthesis of plants, on which the life mostly depends. Usually scientists are measuring the CO2 concentration to know the amount of increasing CO2 concentration in the atmosphere.
To explain: How the scientists know about the Earth’s CO2 concentrations that were hundreds of thousands years ago.
Concept introduction: Global warming, climate change, and global change refer to the climatic change over the globe. Global warming is a significant increase in the average surface temperature of the Earth over various decades. Climate change refers to the alternation in climate change of the Earth for long-term.

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Chapter 25 Solutions
Discover Biology (Sixth Core Edition)
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